Module imagingbook.spectral

Package imagingbook.spectral.dft

Interface Dft2d.Float

All Superinterfaces:

Dft2d

All Known Implementing Classes:

Dft2dDirect.Float, Dft2dFast.Float

Enclosing interface:

Dft2d

public static interface Dft2d.Float
extends Dft2d

Sub-interface for 2D DFT implementations operating on float data.

Nested Class Summary

Nested classes/interfaces inherited from interface imagingbook.spectral.dft.Dft2d

Dft2d.Double, Dft2d.Float

Method Summary

Modifier and Type	Method	Description
default void	checkSize(float[][] A)
default void	extractCol(float[][] g, int u, float[] col)
default void	extractRow(float[][] g, int v, float[] row)
default void	forward(float[][] gRe, float[][] gIm)	Performs an "in-place" forward DFT or FFT on the supplied 2D data.
Dft1d.Float	get1dDft(int size)	Returns a suitable 1D DFT of the specified size (float).
default float[][]	getMagnitude(float[][] re, float[][] im)	Calculates and returns the magnitude of the supplied complex-valued 2D data.
default void	insertCol(float[][] g, int u, float[] col)
default void	insertRow(float[][] g, int v, float[] row)
default void	inverse(float[][] GRe, float[][] GIm)	Performs an "in-place" inverse DFT or FFT on the supplied 2D spectrum.
default void	transform(float[][] inRe, float[][] inIm, boolean forward)	Transforms the given 2D arrays 'in-place'.

Methods inherited from interface imagingbook.spectral.dft.Dft2d

getHeight, getScalingMode, getWidth

Method Details

get1dDft

Dft1d.Float get1dDft(int size)

Returns a suitable 1D DFT of the specified size (float).

Parameters:

size - the size of the DFT

Returns:

a Dft1d.Float instance

transform

default void transform(float[][] inRe,
 float[][] inIm,
 boolean forward)

Transforms the given 2D arrays 'in-place'. Separate arrays of identical size must be supplied for the real and imaginary parts of the signal (forward) or spectrum (inverse), neither of which may be null.

Parameters:

inRe - real part of the input signal or spectrum (modified)

inIm - imaginary part of the input signal or spectrum (modified)

forward - forward transformation if true, inverse transformation if false

extractRow

default void extractRow(float[][] g,
 int v,
 float[] row)

insertRow

default void insertRow(float[][] g,
 int v,
 float[] row)

extractCol

default void extractCol(float[][] g,
 int u,
 float[] col)

insertCol

default void insertCol(float[][] g,
 int u,
 float[] col)

forward

default void forward(float[][] gRe,
 float[][] gIm)

Performs an "in-place" forward DFT or FFT on the supplied 2D data. The input signal is replaced by the associated DFT spectrum.

Parameters:

gRe - real part of the signal (modified)

gIm - imaginary part of the signal (modified)

See Also:

• transform(float[][], float[][], boolean)

inverse

default void inverse(float[][] GRe,
 float[][] GIm)

Performs an "in-place" inverse DFT or FFT on the supplied 2D spectrum. The input spectrum is replaced by the associated signal.

Parameters:

GRe - real part of the spectrum (modified)

GIm - imaginary part of the spectrum (modified)

See Also:

• transform(float[][], float[][], boolean)

checkSize

default void checkSize(float[][] A)

getMagnitude

default float[][] getMagnitude(float[][] re,
 float[][] im)

Calculates and returns the magnitude of the supplied complex-valued 2D data.

Parameters:

re - the real part of the data

im - the imaginary part of the data

Returns:

a 2D array of magnitude values